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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. static union { uint32_t x; uint16_t y[3]; } __attribute__((packed))  u;
  5. static uint64_t x;
  6.  
  7.  
  8.  
  9. int main(void) 
  10. {
  11. 	printf("sizeof uint16_t : %zu\n", sizeof(uint16_t));
  12. 	printf("sizeof uint32_t : %zu\n", sizeof(uint32_t));
  13. 	printf("sizeof int : %zu\n", sizeof(int));
  14. 	printf("sizeof union u : %zu\n", sizeof(u));
  15.  
  16.  
  17. 	printf("&x : %p\n", (void *)&x);
  18. 	printf("&u : %p\n", (void *)&u);
  19. 	printf("Addrr difference : %zu\n", (uint8_t *)&x > (uint8_t *)&u ? (uint8_t *)&x - (uint8_t *)&u : (uint8_t *)&u - (uint8_t *)&x);
  20. 	return 0;
  21. }
  22.  
Success #stdin #stdout 0s 9424KB
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stdin
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stdout
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sizeof uint16_t : 2
sizeof uint32_t : 4
sizeof int : 4
sizeof union u : 6
&x : 0x55fdb8f03038
&u : 0x55fdb8f03040
Addrr difference : 8
https://ideone.com/krfqGr
language:
C (gcc 8.3)
created:
6 years ago
visibility:
secret

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